PSYCHE 
Vol. 56 MARCH, 1949 No. 1 
THE INTEGUMENTARY SENSE ORGANS OF THE 
LARVyE OF RHIPICEPHALINAE (ACARINA) 1 
By J. Dinnik and F. Zumpt 2 
In 1938 Delpy published a short paper describing the 
location and morphology of the so-called spiracles or 
respiratory plates (“stigmates respiratoires”) of vari- 
ous Ixodid larvae. He examined for the purpose Hya- 
lomma dromedarii Koch, H. impressum Koch, Boophilus 
annulatus Say, Rhipicephalus bursa Can. and Fanz., and 
Hcemaphy satis cinnabarina punctata Can. and Fanz. 
Delpy ’s description is brief and lacks illustrations. He 
thought that he saw within each “spiracle” 1 or 2 pores, 
sometimes reduced in size, leading into an atrium pro- 
vided with two valves at the entrance. The base of the 
atrium he described as pierced with an opening, and 
Delpy considered it possible that a tracheal tube was at- 
tached at this point. 
With regard to their position, Delpy distinguished 
coxal and abdominal spiracles. The coxal spiracles are 
in three pairs, placed behind each of the six coxae. The 
abdominal spiracles vary greatly in number and position 
according to the genus. Hccmaphy satis is said to have 
four pairs, Hyalomma and Rhipicephalus only one pair, 
while they are entirely lacking in Boophilus. 
Delpy was not the first, however, to describe supposed 
spiracles in Ixodid larvae. Salmon and Stiles (1902) saw 
1 Preliminary Study No. 10 for a Revision of the Genus Rhipicephalus 
Koch. Nos. 1 to 8 of this series were published in the Zeitschrift fur Para- 
sitenkunde from 1939 to 1943. No. 9 is to appear in Dechiana (Festschrift 
f. Prof. Reichensperger). 
2 Now at The South African Institute for Medical Research, Johannesburg, 
South Africa. 
1 
